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T-568B Colour Code for RJ-45 Plug

 

Eight-conductor data cable contains 4 pairs of wires. The pairs are twisted together. To maintain reliability on Ethernet, you should not untwist them any more than necessary (max of about 1 cm).

 

 

 

 

 

 

 

 

 

 

 

Open end of connector here

 

There are two wiring standards for these cables, called "T-568A" and T-568B" They differ only in connection sequence, not in use of the various colours. The illustration shown is for T-568B. The pairs designated for 10BaseT Ethernet are Orange and Green. The other two pairs, Brown and Blue, can be used for a second Ethernet line or for phone connections.

Note that the Blue pair is on the centre pins and conveniently corresponds to the Red and Green pair in a normal phone line. The connections shown are specifically for an RJ45 plug (the thing on the end of the wire). The wall jack may be wired in a different sequence because the wires are actually crossed inside the jack. The jack should either come with a wiring diagram or at least designate pin numbers that you can match up to the colour code below.

Pin Number Designations
There are pin number designations for each colour in T568B as well. The pin designations are as follows:
 

Colour Codes for T568B

Pin

Colour 

Pair 

Name

1

wh/or

2

TxData +

2

or

2

TxData -

3

wh/grn

3

RecvData+

4

blu

1

 

5

wh/blu

1

 

6

grn

3

RecvData-

7

wh/brn

4

 

8

brn

4

 

Note that the odd pin numbers are always the white with stripe colour.


Wiring Diagrams for Straight Through and Cross Over cables

Note: The hook is underneath in all cases and Pin one is always on the left viewed from the end of the connector where the cable is inserted
 

Straight Through Cable

Colour Code

Colour

Pin 1 
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8

white orange
orange
white green
blue
white blue
green
white brown
brown








 

Cross Over Cable

Colour Code

Colour

Pin 1 
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8

white green
green
white orange
blue
white blue
orange
white brown
brown








The other side is a straight through cable.

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